// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// See https://github.com/flutter/flutter/blob/main/engine/src/flutter/lib/ui/geometry.dart for
// documentation of APIs.
part of ui;

double toDegrees(double radians) {
  return radians * 180 / math.pi;
}

abstract class OffsetBase {
  const OffsetBase(this._dx, this._dy);

  final double _dx;
  final double _dy;
  bool get isInfinite => _dx >= double.infinity || _dy >= double.infinity;
  bool get isFinite => _dx.isFinite && _dy.isFinite;
  bool operator <(OffsetBase other) => _dx < other._dx && _dy < other._dy;
  bool operator <=(OffsetBase other) => _dx <= other._dx && _dy <= other._dy;
  bool operator >(OffsetBase other) => _dx > other._dx && _dy > other._dy;
  bool operator >=(OffsetBase other) => _dx >= other._dx && _dy >= other._dy;
  @override
  bool operator ==(Object other) {
    return other is OffsetBase && other._dx == _dx && other._dy == _dy;
  }

  @override
  int get hashCode => Object.hash(_dx, _dy);

  @override
  String toString() => 'OffsetBase(${_dx.toStringAsFixed(1)}, ${_dy.toStringAsFixed(1)})';
}

class Offset extends OffsetBase {
  const Offset(super.dx, super.dy);
  factory Offset.fromDirection(double direction, [double distance = 1.0]) {
    return Offset(distance * math.cos(direction), distance * math.sin(direction));
  }
  double get dx => _dx;
  double get dy => _dy;
  double get distance => math.sqrt(dx * dx + dy * dy);
  double get distanceSquared => dx * dx + dy * dy;
  double get direction => math.atan2(dy, dx);
  static const Offset zero = Offset(0.0, 0.0);
  // This is included for completeness, because [Size.infinite] exists.
  static const Offset infinite = Offset(double.infinity, double.infinity);
  Offset scale(double scaleX, double scaleY) => Offset(dx * scaleX, dy * scaleY);
  Offset translate(double translateX, double translateY) =>
      Offset(dx + translateX, dy + translateY);
  Offset operator -() => Offset(-dx, -dy);
  Offset operator -(Offset other) => Offset(dx - other.dx, dy - other.dy);
  Offset operator +(Offset other) => Offset(dx + other.dx, dy + other.dy);
  Offset operator *(double operand) => Offset(dx * operand, dy * operand);
  Offset operator /(double operand) => Offset(dx / operand, dy / operand);
  Offset operator ~/(double operand) =>
      Offset((dx ~/ operand).toDouble(), (dy ~/ operand).toDouble());
  Offset operator %(double operand) => Offset(dx % operand, dy % operand);
  Rect operator &(Size other) => Rect.fromLTWH(dx, dy, other.width, other.height);
  static Offset? lerp(Offset? a, Offset? b, double t) {
    if (b == null) {
      if (a == null) {
        return null;
      } else {
        return a * (1.0 - t);
      }
    } else {
      if (a == null) {
        return b * t;
      } else {
        return Offset(_lerpDouble(a.dx, b.dx, t), _lerpDouble(a.dy, b.dy, t));
      }
    }
  }

  @override
  bool operator ==(Object other) {
    return other is Offset && other.dx == dx && other.dy == dy;
  }

  @override
  int get hashCode => Object.hash(dx, dy);

  @override
  String toString() => 'Offset(${dx.toStringAsFixed(1)}, ${dy.toStringAsFixed(1)})';
}

class Size extends OffsetBase {
  const Size(super.width, super.height);
  // Used by the rendering library's _DebugSize hack.
  Size.copy(Size source) : super(source.width, source.height);
  const Size.square(double dimension) : super(dimension, dimension);
  const Size.fromWidth(double width) : super(width, double.infinity);
  const Size.fromHeight(double height) : super(double.infinity, height);
  const Size.fromRadius(double radius) : super(radius * 2.0, radius * 2.0);
  double get width => _dx;
  double get height => _dy;
  double get aspectRatio {
    if (height != 0.0) {
      return width / height;
    }
    if (width > 0.0) {
      return double.infinity;
    }
    if (width < 0.0) {
      return double.negativeInfinity;
    }
    return 0.0;
  }

  static const Size zero = Size(0.0, 0.0);
  static const Size infinite = Size(double.infinity, double.infinity);
  bool get isEmpty => width <= 0.0 || height <= 0.0;
  OffsetBase operator -(OffsetBase other) {
    if (other is Size) {
      return Offset(width - other.width, height - other.height);
    }
    if (other is Offset) {
      return Size(width - other.dx, height - other.dy);
    }
    throw ArgumentError(other);
  }

  Size operator +(Offset other) => Size(width + other.dx, height + other.dy);
  Size operator *(double operand) => Size(width * operand, height * operand);
  Size operator /(double operand) => Size(width / operand, height / operand);
  Size operator ~/(double operand) =>
      Size((width ~/ operand).toDouble(), (height ~/ operand).toDouble());
  Size operator %(double operand) => Size(width % operand, height % operand);
  double get shortestSide => math.min(width.abs(), height.abs());
  double get longestSide => math.max(width.abs(), height.abs());

  // Convenience methods that do the equivalent of calling the similarly named
  // methods on a Rect constructed from the given origin and this size.
  Offset topLeft(Offset origin) => origin;
  Offset topCenter(Offset origin) => Offset(origin.dx + width / 2.0, origin.dy);
  Offset topRight(Offset origin) => Offset(origin.dx + width, origin.dy);
  Offset centerLeft(Offset origin) => Offset(origin.dx, origin.dy + height / 2.0);
  Offset center(Offset origin) => Offset(origin.dx + width / 2.0, origin.dy + height / 2.0);
  Offset centerRight(Offset origin) => Offset(origin.dx + width, origin.dy + height / 2.0);
  Offset bottomLeft(Offset origin) => Offset(origin.dx, origin.dy + height);
  Offset bottomCenter(Offset origin) => Offset(origin.dx + width / 2.0, origin.dy + height);
  Offset bottomRight(Offset origin) => Offset(origin.dx + width, origin.dy + height);
  bool contains(Offset offset) {
    return offset.dx >= 0.0 && offset.dx < width && offset.dy >= 0.0 && offset.dy < height;
  }

  Size get flipped => Size(height, width);
  static Size? lerp(Size? a, Size? b, double t) {
    if (b == null) {
      if (a == null) {
        return null;
      } else {
        return a * (1.0 - t);
      }
    } else {
      if (a == null) {
        return b * t;
      } else {
        return Size(_lerpDouble(a.width, b.width, t), _lerpDouble(a.height, b.height, t));
      }
    }
  }

  // We don't compare the runtimeType because of _DebugSize in the framework.
  @override
  bool operator ==(Object other) {
    return other is Size && other._dx == _dx && other._dy == _dy;
  }

  @override
  int get hashCode => Object.hash(_dx, _dy);

  @override
  String toString() => 'Size(${width.toStringAsFixed(1)}, ${height.toStringAsFixed(1)})';
}

class Rect {
  const Rect.fromLTRB(this.left, this.top, this.right, this.bottom);

  const Rect.fromLTWH(double left, double top, double width, double height)
    : this.fromLTRB(left, top, left + width, top + height);

  Rect.fromCircle({required Offset center, required double radius})
    : this.fromCenter(center: center, width: radius * 2, height: radius * 2);

  Rect.fromCenter({required Offset center, required double width, required double height})
    : this.fromLTRB(
        center.dx - width / 2,
        center.dy - height / 2,
        center.dx + width / 2,
        center.dy + height / 2,
      );

  Rect.fromPoints(Offset a, Offset b)
    : this.fromLTRB(
        math.min(a.dx, b.dx),
        math.min(a.dy, b.dy),
        math.max(a.dx, b.dx),
        math.max(a.dy, b.dy),
      );

  final double left;
  final double top;
  final double right;
  final double bottom;
  double get width => right - left;
  double get height => bottom - top;
  Size get size => Size(width, height);
  bool get hasNaN => left.isNaN || top.isNaN || right.isNaN || bottom.isNaN;
  static const Rect zero = Rect.fromLTRB(0.0, 0.0, 0.0, 0.0);

  static const double _giantScalar = 1.0E+9; // matches kGiantRect from layer.h
  static const Rect largest = Rect.fromLTRB(
    -_giantScalar,
    -_giantScalar,
    _giantScalar,
    _giantScalar,
  );
  // included for consistency with Offset and Size
  bool get isInfinite {
    return left >= double.infinity ||
        top >= double.infinity ||
        right >= double.infinity ||
        bottom >= double.infinity;
  }

  bool get isFinite => left.isFinite && top.isFinite && right.isFinite && bottom.isFinite;
  bool get isEmpty => left >= right || top >= bottom;
  Rect shift(Offset offset) {
    return Rect.fromLTRB(left + offset.dx, top + offset.dy, right + offset.dx, bottom + offset.dy);
  }

  Rect translate(double translateX, double translateY) {
    return Rect.fromLTRB(
      left + translateX,
      top + translateY,
      right + translateX,
      bottom + translateY,
    );
  }

  Rect inflate(double delta) {
    return Rect.fromLTRB(left - delta, top - delta, right + delta, bottom + delta);
  }

  Rect deflate(double delta) => inflate(-delta);
  Rect intersect(Rect other) {
    return Rect.fromLTRB(
      math.max(left, other.left),
      math.max(top, other.top),
      math.min(right, other.right),
      math.min(bottom, other.bottom),
    );
  }

  Rect expandToInclude(Rect other) {
    return Rect.fromLTRB(
      math.min(left, other.left),
      math.min(top, other.top),
      math.max(right, other.right),
      math.max(bottom, other.bottom),
    );
  }

  bool overlaps(Rect other) {
    if (right <= other.left || other.right <= left) {
      return false;
    }
    if (bottom <= other.top || other.bottom <= top) {
      return false;
    }
    return true;
  }

  double get shortestSide => math.min(width.abs(), height.abs());
  double get longestSide => math.max(width.abs(), height.abs());
  Offset get topLeft => Offset(left, top);
  Offset get topCenter => Offset(left + width / 2.0, top);
  Offset get topRight => Offset(right, top);
  Offset get centerLeft => Offset(left, top + height / 2.0);
  Offset get center => Offset(left + width / 2.0, top + height / 2.0);
  Offset get centerRight => Offset(right, top + height / 2.0);
  Offset get bottomLeft => Offset(left, bottom);
  Offset get bottomCenter => Offset(left + width / 2.0, bottom);
  Offset get bottomRight => Offset(right, bottom);
  bool contains(Offset offset) {
    return offset.dx >= left && offset.dx < right && offset.dy >= top && offset.dy < bottom;
  }

  static Rect? lerp(Rect? a, Rect? b, double t) {
    if (b == null) {
      if (a == null) {
        return null;
      } else {
        final double k = 1.0 - t;
        return Rect.fromLTRB(a.left * k, a.top * k, a.right * k, a.bottom * k);
      }
    } else {
      if (a == null) {
        return Rect.fromLTRB(b.left * t, b.top * t, b.right * t, b.bottom * t);
      } else {
        return Rect.fromLTRB(
          _lerpDouble(a.left, b.left, t),
          _lerpDouble(a.top, b.top, t),
          _lerpDouble(a.right, b.right, t),
          _lerpDouble(a.bottom, b.bottom, t),
        );
      }
    }
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    if (runtimeType != other.runtimeType) {
      return false;
    }
    return other is Rect &&
        other.left == left &&
        other.top == top &&
        other.right == right &&
        other.bottom == bottom;
  }

  @override
  int get hashCode => Object.hash(left, top, right, bottom);

  @override
  String toString() =>
      'Rect.fromLTRB(${left.toStringAsFixed(1)}, ${top.toStringAsFixed(1)}, ${right.toStringAsFixed(1)}, ${bottom.toStringAsFixed(1)})';
}

class Radius {
  const Radius.circular(double radius) : this.elliptical(radius, radius);
  const Radius.elliptical(this.x, this.y);
  final double x;
  final double y;
  static const Radius zero = Radius.circular(0.0);
  Radius clamp({Radius? minimum, Radius? maximum}) {
    minimum ??= const Radius.circular(-double.infinity);
    maximum ??= const Radius.circular(double.infinity);
    return Radius.elliptical(
      clampDouble(x, minimum.x, maximum.x),
      clampDouble(y, minimum.y, maximum.y),
    );
  }

  Radius clampValues({double? minimumX, double? minimumY, double? maximumX, double? maximumY}) {
    return Radius.elliptical(
      clampDouble(x, minimumX ?? -double.infinity, maximumX ?? double.infinity),
      clampDouble(y, minimumY ?? -double.infinity, maximumY ?? double.infinity),
    );
  }

  Radius operator -() => Radius.elliptical(-x, -y);
  Radius operator -(Radius other) => Radius.elliptical(x - other.x, y - other.y);
  Radius operator +(Radius other) => Radius.elliptical(x + other.x, y + other.y);
  Radius operator *(double operand) => Radius.elliptical(x * operand, y * operand);
  Radius operator /(double operand) => Radius.elliptical(x / operand, y / operand);
  Radius operator ~/(double operand) =>
      Radius.elliptical((x ~/ operand).toDouble(), (y ~/ operand).toDouble());
  Radius operator %(double operand) => Radius.elliptical(x % operand, y % operand);
  static Radius? lerp(Radius? a, Radius? b, double t) {
    if (b == null) {
      if (a == null) {
        return null;
      } else {
        final double k = 1.0 - t;
        return Radius.elliptical(a.x * k, a.y * k);
      }
    } else {
      if (a == null) {
        return Radius.elliptical(b.x * t, b.y * t);
      } else {
        return Radius.elliptical(_lerpDouble(a.x, b.x, t), _lerpDouble(a.y, b.y, t));
      }
    }
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    if (runtimeType != other.runtimeType) {
      return false;
    }

    return other is Radius && other.x == x && other.y == y;
  }

  @override
  int get hashCode => Object.hash(x, y);

  @override
  String toString() {
    return x == y
        ? 'Radius.circular(${x.toStringAsFixed(1)})'
        : 'Radius.elliptical(${x.toStringAsFixed(1)}, '
              '${y.toStringAsFixed(1)})';
  }
}

abstract class _RRectLike<T extends _RRectLike<T>> {
  const _RRectLike({
    required this.left,
    required this.top,
    required this.right,
    required this.bottom,
    required this.tlRadiusX,
    required this.tlRadiusY,
    required this.trRadiusX,
    required this.trRadiusY,
    required this.brRadiusX,
    required this.brRadiusY,
    required this.blRadiusX,
    required this.blRadiusY,
  }) : assert(tlRadiusX >= 0),
       assert(tlRadiusY >= 0),
       assert(trRadiusX >= 0),
       assert(trRadiusY >= 0),
       assert(brRadiusX >= 0),
       assert(brRadiusY >= 0),
       assert(blRadiusX >= 0),
       assert(blRadiusY >= 0);

  T _create({
    required double left,
    required double top,
    required double right,
    required double bottom,
    required double tlRadiusX,
    required double tlRadiusY,
    required double trRadiusX,
    required double trRadiusY,
    required double brRadiusX,
    required double brRadiusY,
    required double blRadiusX,
    required double blRadiusY,
    required bool uniformRadii,
  });

  final double left;
  final double top;
  final double right;
  final double bottom;
  final double tlRadiusX;
  final double tlRadiusY;
  Radius get tlRadius => Radius.elliptical(tlRadiusX, tlRadiusY);
  final double trRadiusX;
  final double trRadiusY;
  Radius get trRadius => Radius.elliptical(trRadiusX, trRadiusY);
  final double brRadiusX;
  final double brRadiusY;
  Radius get brRadius => Radius.elliptical(brRadiusX, brRadiusY);
  final double blRadiusX;
  final double blRadiusY;
  Radius get blRadius => Radius.elliptical(blRadiusX, blRadiusY);

  // Whether the radii of the four corners are guaranteed to be the same.
  //
  // This is a Web-only flag for optimization.
  //
  // Returns `true` only if the object was constructed in a way that guarantees
  // all radii are equal (e.g., from `.fromRectAndRadius`), saving the cost of
  // checking the corner radii fields individually.
  //
  // A `false` return value does not mean the radii are necessarily different.
  // It simply means there's no guarantee, and they must be compared manually
  // if uniformity needs to be determined.
  bool get _uniformRadii => false;

  T shift(Offset offset) {
    return _create(
      left: left + offset.dx,
      top: top + offset.dy,
      right: right + offset.dx,
      bottom: bottom + offset.dy,
      tlRadiusX: tlRadiusX,
      tlRadiusY: tlRadiusY,
      trRadiusX: trRadiusX,
      trRadiusY: trRadiusY,
      blRadiusX: blRadiusX,
      blRadiusY: blRadiusY,
      brRadiusX: brRadiusX,
      brRadiusY: brRadiusY,
      uniformRadii: _uniformRadii,
    );
  }

  T inflate(double delta) {
    return _create(
      left: left - delta,
      top: top - delta,
      right: right + delta,
      bottom: bottom + delta,
      tlRadiusX: math.max(0, tlRadiusX + delta),
      tlRadiusY: math.max(0, tlRadiusY + delta),
      trRadiusX: math.max(0, trRadiusX + delta),
      trRadiusY: math.max(0, trRadiusY + delta),
      blRadiusX: math.max(0, blRadiusX + delta),
      blRadiusY: math.max(0, blRadiusY + delta),
      brRadiusX: math.max(0, brRadiusX + delta),
      brRadiusY: math.max(0, brRadiusY + delta),
      uniformRadii: _uniformRadii,
    );
  }

  T deflate(double delta) => inflate(-delta);
  double get width => right - left;
  double get height => bottom - top;
  Rect get outerRect => Rect.fromLTRB(left, top, right, bottom);
  Rect get safeInnerRect {
    const double kInsetFactor = 0.29289321881; // 1-cos(pi/4)

    final double leftRadius = math.max(blRadiusX, tlRadiusX);
    final double topRadius = math.max(tlRadiusY, trRadiusY);
    final double rightRadius = math.max(trRadiusX, brRadiusX);
    final double bottomRadius = math.max(brRadiusY, blRadiusY);

    return Rect.fromLTRB(
      left + leftRadius * kInsetFactor,
      top + topRadius * kInsetFactor,
      right - rightRadius * kInsetFactor,
      bottom - bottomRadius * kInsetFactor,
    );
  }

  Rect get middleRect {
    final double leftRadius = math.max(blRadiusX, tlRadiusX);
    final double topRadius = math.max(tlRadiusY, trRadiusY);
    final double rightRadius = math.max(trRadiusX, brRadiusX);
    final double bottomRadius = math.max(brRadiusY, blRadiusY);
    return Rect.fromLTRB(
      left + leftRadius,
      top + topRadius,
      right - rightRadius,
      bottom - bottomRadius,
    );
  }

  Rect get wideMiddleRect {
    final double topRadius = math.max(tlRadiusY, trRadiusY);
    final double bottomRadius = math.max(brRadiusY, blRadiusY);
    return Rect.fromLTRB(left, top + topRadius, right, bottom - bottomRadius);
  }

  Rect get tallMiddleRect {
    final double leftRadius = math.max(blRadiusX, tlRadiusX);
    final double rightRadius = math.max(trRadiusX, brRadiusX);
    return Rect.fromLTRB(left + leftRadius, top, right - rightRadius, bottom);
  }

  bool get isEmpty => left >= right || top >= bottom;
  bool get isFinite => left.isFinite && top.isFinite && right.isFinite && bottom.isFinite;
  bool get isRect {
    return (tlRadiusX == 0.0 || tlRadiusY == 0.0) &&
        (trRadiusX == 0.0 || trRadiusY == 0.0) &&
        (blRadiusX == 0.0 || blRadiusY == 0.0) &&
        (brRadiusX == 0.0 || brRadiusY == 0.0);
  }

  bool get isStadium {
    return tlRadius == trRadius &&
        trRadius == brRadius &&
        brRadius == blRadius &&
        (width <= 2.0 * tlRadiusX || height <= 2.0 * tlRadiusY);
  }

  bool get isEllipse {
    return tlRadius == trRadius &&
        trRadius == brRadius &&
        brRadius == blRadius &&
        width <= 2.0 * tlRadiusX &&
        height <= 2.0 * tlRadiusY;
  }

  bool get isCircle => width == height && isEllipse;
  double get shortestSide => math.min(width.abs(), height.abs());
  double get longestSide => math.max(width.abs(), height.abs());
  bool get hasNaN =>
      left.isNaN ||
      top.isNaN ||
      right.isNaN ||
      bottom.isNaN ||
      trRadiusX.isNaN ||
      trRadiusY.isNaN ||
      tlRadiusX.isNaN ||
      tlRadiusY.isNaN ||
      brRadiusX.isNaN ||
      brRadiusY.isNaN ||
      blRadiusX.isNaN ||
      blRadiusY.isNaN;
  Offset get center => Offset(left + width / 2.0, top + height / 2.0);

  // Returns the minimum between min and scale to which radius1 and radius2
  // should be scaled with in order not to exceed the limit.
  double _getMin(double min, double radius1, double radius2, double limit) {
    final double sum = radius1 + radius2;
    if (sum > limit && sum != 0.0) {
      return math.min(min, limit / sum);
    }
    return min;
  }

  T scaleRadii() {
    double scale = 1.0;
    final double absWidth = width.abs();
    final double absHeight = height.abs();
    scale = _getMin(scale, blRadiusY, tlRadiusY, absHeight);
    scale = _getMin(scale, tlRadiusX, trRadiusX, absWidth);
    scale = _getMin(scale, trRadiusY, brRadiusY, absHeight);
    scale = _getMin(scale, brRadiusX, blRadiusX, absWidth);

    if (scale < 1.0) {
      return _create(
        top: top,
        left: left,
        right: right,
        bottom: bottom,
        tlRadiusX: tlRadiusX * scale,
        tlRadiusY: tlRadiusY * scale,
        trRadiusX: trRadiusX * scale,
        trRadiusY: trRadiusY * scale,
        blRadiusX: blRadiusX * scale,
        blRadiusY: blRadiusY * scale,
        brRadiusX: brRadiusX * scale,
        brRadiusY: brRadiusY * scale,
        uniformRadii: _uniformRadii,
      );
    }

    return _create(
      top: top,
      left: left,
      right: right,
      bottom: bottom,
      tlRadiusX: tlRadiusX,
      tlRadiusY: tlRadiusY,
      trRadiusX: trRadiusX,
      trRadiusY: trRadiusY,
      blRadiusX: blRadiusX,
      blRadiusY: blRadiusY,
      brRadiusX: brRadiusX,
      brRadiusY: brRadiusY,
      uniformRadii: _uniformRadii,
    );
  }

  // Linearly interpolate between this object and another of the same shape.
  T _lerpTo(T? b, double t) {
    assert(runtimeType == T);
    if (b == null) {
      final double k = 1.0 - t;
      return _create(
        left: left * k,
        top: top * k,
        right: right * k,
        bottom: bottom * k,
        tlRadiusX: math.max(0, tlRadiusX * k),
        tlRadiusY: math.max(0, tlRadiusY * k),
        trRadiusX: math.max(0, trRadiusX * k),
        trRadiusY: math.max(0, trRadiusY * k),
        brRadiusX: math.max(0, brRadiusX * k),
        brRadiusY: math.max(0, brRadiusY * k),
        blRadiusX: math.max(0, blRadiusX * k),
        blRadiusY: math.max(0, blRadiusY * k),
        uniformRadii: _uniformRadii,
      );
    } else {
      return _create(
        left: _lerpDouble(left, b.left, t),
        top: _lerpDouble(top, b.top, t),
        right: _lerpDouble(right, b.right, t),
        bottom: _lerpDouble(bottom, b.bottom, t),
        tlRadiusX: math.max(0, _lerpDouble(tlRadiusX, b.tlRadiusX, t)),
        tlRadiusY: math.max(0, _lerpDouble(tlRadiusY, b.tlRadiusY, t)),
        trRadiusX: math.max(0, _lerpDouble(trRadiusX, b.trRadiusX, t)),
        trRadiusY: math.max(0, _lerpDouble(trRadiusY, b.trRadiusY, t)),
        brRadiusX: math.max(0, _lerpDouble(brRadiusX, b.brRadiusX, t)),
        brRadiusY: math.max(0, _lerpDouble(brRadiusY, b.brRadiusY, t)),
        blRadiusX: math.max(0, _lerpDouble(blRadiusX, b.blRadiusX, t)),
        blRadiusY: math.max(0, _lerpDouble(blRadiusY, b.blRadiusY, t)),
        uniformRadii: _uniformRadii,
      );
    }
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    if (runtimeType != other.runtimeType) {
      return false;
    }
    return other is _RRectLike &&
        other.left == left &&
        other.top == top &&
        other.right == right &&
        other.bottom == bottom &&
        other.tlRadiusX == tlRadiusX &&
        other.tlRadiusY == tlRadiusY &&
        other.trRadiusX == trRadiusX &&
        other.trRadiusY == trRadiusY &&
        other.blRadiusX == blRadiusX &&
        other.blRadiusY == blRadiusY &&
        other.brRadiusX == brRadiusX &&
        other.brRadiusY == brRadiusY;
  }

  @override
  int get hashCode => Object.hash(
    left,
    top,
    right,
    bottom,
    tlRadiusX,
    tlRadiusY,
    trRadiusX,
    trRadiusY,
    blRadiusX,
    blRadiusY,
    brRadiusX,
    brRadiusY,
  );

  String _toString({required String className}) {
    final String rect =
        '${left.toStringAsFixed(1)}, '
        '${top.toStringAsFixed(1)}, '
        '${right.toStringAsFixed(1)}, '
        '${bottom.toStringAsFixed(1)}';
    if (tlRadius == trRadius && trRadius == brRadius && brRadius == blRadius) {
      if (tlRadius.x == tlRadius.y) {
        return '$className.fromLTRBR($rect, ${tlRadius.x.toStringAsFixed(1)})';
      }
      return '$className.fromLTRBXY($rect, ${tlRadius.x.toStringAsFixed(1)}, ${tlRadius.y.toStringAsFixed(1)})';
    }
    return '$className.fromLTRBAndCorners('
        '$rect, '
        'topLeft: $tlRadius, '
        'topRight: $trRadius, '
        'bottomRight: $brRadius, '
        'bottomLeft: $blRadius'
        ')';
  }
}

class RRect extends _RRectLike<RRect> {
  const RRect.fromLTRBXY(
    double left,
    double top,
    double right,
    double bottom,
    double radiusX,
    double radiusY,
  ) : this._raw(
        top: top,
        left: left,
        right: right,
        bottom: bottom,
        tlRadiusX: radiusX,
        tlRadiusY: radiusY,
        trRadiusX: radiusX,
        trRadiusY: radiusY,
        blRadiusX: radiusX,
        blRadiusY: radiusY,
        brRadiusX: radiusX,
        brRadiusY: radiusY,
      );

  RRect.fromLTRBR(double left, double top, double right, double bottom, Radius radius)
    : this._raw(
        top: top,
        left: left,
        right: right,
        bottom: bottom,
        tlRadiusX: radius.x,
        tlRadiusY: radius.y,
        trRadiusX: radius.x,
        trRadiusY: radius.y,
        blRadiusX: radius.x,
        blRadiusY: radius.y,
        brRadiusX: radius.x,
        brRadiusY: radius.y,
      );

  RRect.fromRectXY(Rect rect, double radiusX, double radiusY)
    : this._raw(
        top: rect.top,
        left: rect.left,
        right: rect.right,
        bottom: rect.bottom,
        tlRadiusX: radiusX,
        tlRadiusY: radiusY,
        trRadiusX: radiusX,
        trRadiusY: radiusY,
        blRadiusX: radiusX,
        blRadiusY: radiusY,
        brRadiusX: radiusX,
        brRadiusY: radiusY,
      );

  RRect.fromRectAndRadius(Rect rect, Radius radius)
    : this._raw(
        top: rect.top,
        left: rect.left,
        right: rect.right,
        bottom: rect.bottom,
        tlRadiusX: radius.x,
        tlRadiusY: radius.y,
        trRadiusX: radius.x,
        trRadiusY: radius.y,
        blRadiusX: radius.x,
        blRadiusY: radius.y,
        brRadiusX: radius.x,
        brRadiusY: radius.y,
      );

  RRect.fromLTRBAndCorners(
    double left,
    double top,
    double right,
    double bottom, {
    Radius topLeft = Radius.zero,
    Radius topRight = Radius.zero,
    Radius bottomRight = Radius.zero,
    Radius bottomLeft = Radius.zero,
  }) : this._raw(
         top: top,
         left: left,
         right: right,
         bottom: bottom,
         tlRadiusX: topLeft.x,
         tlRadiusY: topLeft.y,
         trRadiusX: topRight.x,
         trRadiusY: topRight.y,
         blRadiusX: bottomLeft.x,
         blRadiusY: bottomLeft.y,
         brRadiusX: bottomRight.x,
         brRadiusY: bottomRight.y,
       );

  RRect.fromRectAndCorners(
    Rect rect, {
    Radius topLeft = Radius.zero,
    Radius topRight = Radius.zero,
    Radius bottomRight = Radius.zero,
    Radius bottomLeft = Radius.zero,
  }) : this._raw(
         top: rect.top,
         left: rect.left,
         right: rect.right,
         bottom: rect.bottom,
         tlRadiusX: topLeft.x,
         tlRadiusY: topLeft.y,
         trRadiusX: topRight.x,
         trRadiusY: topRight.y,
         blRadiusX: bottomLeft.x,
         blRadiusY: bottomLeft.y,
         brRadiusX: bottomRight.x,
         brRadiusY: bottomRight.y,
       );

  const RRect._raw({
    super.left = 0.0,
    super.top = 0.0,
    super.right = 0.0,
    super.bottom = 0.0,
    super.tlRadiusX = 0.0,
    super.tlRadiusY = 0.0,
    super.trRadiusX = 0.0,
    super.trRadiusY = 0.0,
    super.brRadiusX = 0.0,
    super.brRadiusY = 0.0,
    super.blRadiusX = 0.0,
    super.blRadiusY = 0.0,
  });

  @override
  RRect _create({
    required double left,
    required double top,
    required double right,
    required double bottom,
    required double tlRadiusX,
    required double tlRadiusY,
    required double trRadiusX,
    required double trRadiusY,
    required double brRadiusX,
    required double brRadiusY,
    required double blRadiusX,
    required double blRadiusY,
    required bool uniformRadii, // Not used. See `get _uniformRadii`.
  }) => RRect._raw(
    top: top,
    left: left,
    right: right,
    bottom: bottom,
    tlRadiusX: tlRadiusX,
    tlRadiusY: tlRadiusY,
    trRadiusX: trRadiusX,
    trRadiusY: trRadiusY,
    blRadiusX: blRadiusX,
    blRadiusY: blRadiusY,
    brRadiusX: brRadiusX,
    brRadiusY: brRadiusY,
  );

  // RRect doesn't need uniformRadii for optimization for now.
  @override
  bool get _uniformRadii => false;

  static const RRect zero = RRect._raw();

  bool contains(Offset point) {
    if (point.dx < left || point.dx >= right || point.dy < top || point.dy >= bottom) {
      return false;
    } // outside bounding box

    final RRect scaled = scaleRadii();

    double x;
    double y;
    double radiusX;
    double radiusY;
    // check whether point is in one of the rounded corner areas
    // x, y -> translate to ellipse center
    if (point.dx < left + scaled.tlRadiusX && point.dy < top + scaled.tlRadiusY) {
      x = point.dx - left - scaled.tlRadiusX;
      y = point.dy - top - scaled.tlRadiusY;
      radiusX = scaled.tlRadiusX;
      radiusY = scaled.tlRadiusY;
    } else if (point.dx > right - scaled.trRadiusX && point.dy < top + scaled.trRadiusY) {
      x = point.dx - right + scaled.trRadiusX;
      y = point.dy - top - scaled.trRadiusY;
      radiusX = scaled.trRadiusX;
      radiusY = scaled.trRadiusY;
    } else if (point.dx > right - scaled.brRadiusX && point.dy > bottom - scaled.brRadiusY) {
      x = point.dx - right + scaled.brRadiusX;
      y = point.dy - bottom + scaled.brRadiusY;
      radiusX = scaled.brRadiusX;
      radiusY = scaled.brRadiusY;
    } else if (point.dx < left + scaled.blRadiusX && point.dy > bottom - scaled.blRadiusY) {
      x = point.dx - left - scaled.blRadiusX;
      y = point.dy - bottom + scaled.blRadiusY;
      radiusX = scaled.blRadiusX;
      radiusY = scaled.blRadiusY;
    } else {
      return true; // inside and not within the rounded corner area
    }

    x = x / radiusX;
    y = y / radiusY;
    // check if the point is outside the unit circle
    if (x * x + y * y > 1.0) {
      return false;
    }
    return true;
  }

  static RRect? lerp(RRect? a, RRect? b, double t) {
    if (a == null) {
      if (b == null) {
        return null;
      }
      return b._lerpTo(null, 1 - t);
    }
    return a._lerpTo(b, t);
  }

  @override
  String toString() {
    return _toString(className: 'RRect');
  }
}

class RSuperellipse extends _RRectLike<RSuperellipse> {
  const RSuperellipse.fromLTRBXY(
    double left,
    double top,
    double right,
    double bottom,
    double radiusX,
    double radiusY,
  ) : this._raw(
        top: top,
        left: left,
        right: right,
        bottom: bottom,
        tlRadiusX: radiusX,
        tlRadiusY: radiusY,
        trRadiusX: radiusX,
        trRadiusY: radiusY,
        blRadiusX: radiusX,
        blRadiusY: radiusY,
        brRadiusX: radiusX,
        brRadiusY: radiusY,
        uniformRadii: true,
      );

  RSuperellipse.fromLTRBR(double left, double top, double right, double bottom, Radius radius)
    : this._raw(
        top: top,
        left: left,
        right: right,
        bottom: bottom,
        tlRadiusX: radius.x,
        tlRadiusY: radius.y,
        trRadiusX: radius.x,
        trRadiusY: radius.y,
        blRadiusX: radius.x,
        blRadiusY: radius.y,
        brRadiusX: radius.x,
        brRadiusY: radius.y,
        uniformRadii: true,
      );

  RSuperellipse.fromRectXY(Rect rect, double radiusX, double radiusY)
    : this._raw(
        top: rect.top,
        left: rect.left,
        right: rect.right,
        bottom: rect.bottom,
        tlRadiusX: radiusX,
        tlRadiusY: radiusY,
        trRadiusX: radiusX,
        trRadiusY: radiusY,
        blRadiusX: radiusX,
        blRadiusY: radiusY,
        brRadiusX: radiusX,
        brRadiusY: radiusY,
        uniformRadii: true,
      );

  RSuperellipse.fromRectAndRadius(Rect rect, Radius radius)
    : this._raw(
        top: rect.top,
        left: rect.left,
        right: rect.right,
        bottom: rect.bottom,
        tlRadiusX: radius.x,
        tlRadiusY: radius.y,
        trRadiusX: radius.x,
        trRadiusY: radius.y,
        blRadiusX: radius.x,
        blRadiusY: radius.y,
        brRadiusX: radius.x,
        brRadiusY: radius.y,
        uniformRadii: true,
      );

  RSuperellipse.fromLTRBAndCorners(
    double left,
    double top,
    double right,
    double bottom, {
    Radius topLeft = Radius.zero,
    Radius topRight = Radius.zero,
    Radius bottomRight = Radius.zero,
    Radius bottomLeft = Radius.zero,
  }) : this._raw(
         top: top,
         left: left,
         right: right,
         bottom: bottom,
         tlRadiusX: topLeft.x,
         tlRadiusY: topLeft.y,
         trRadiusX: topRight.x,
         trRadiusY: topRight.y,
         blRadiusX: bottomLeft.x,
         blRadiusY: bottomLeft.y,
         brRadiusX: bottomRight.x,
         brRadiusY: bottomRight.y,
         uniformRadii:
             topLeft.x == topRight.x &&
             topLeft.y == topRight.y &&
             topLeft.x == bottomLeft.x &&
             topLeft.y == bottomLeft.y &&
             topLeft.x == bottomRight.x &&
             topLeft.y == bottomRight.y,
       );

  RSuperellipse.fromRectAndCorners(
    Rect rect, {
    Radius topLeft = Radius.zero,
    Radius topRight = Radius.zero,
    Radius bottomRight = Radius.zero,
    Radius bottomLeft = Radius.zero,
  }) : this._raw(
         top: rect.top,
         left: rect.left,
         right: rect.right,
         bottom: rect.bottom,
         tlRadiusX: topLeft.x,
         tlRadiusY: topLeft.y,
         trRadiusX: topRight.x,
         trRadiusY: topRight.y,
         blRadiusX: bottomLeft.x,
         blRadiusY: bottomLeft.y,
         brRadiusX: bottomRight.x,
         brRadiusY: bottomRight.y,
         uniformRadii:
             topLeft.x == topRight.x &&
             topLeft.y == topRight.y &&
             topLeft.x == bottomLeft.x &&
             topLeft.y == bottomLeft.y &&
             topLeft.x == bottomRight.x &&
             topLeft.y == bottomRight.y,
       );

  const RSuperellipse._raw({
    super.left = 0.0,
    super.top = 0.0,
    super.right = 0.0,
    super.bottom = 0.0,
    super.tlRadiusX = 0.0,
    super.tlRadiusY = 0.0,
    super.trRadiusX = 0.0,
    super.trRadiusY = 0.0,
    super.brRadiusX = 0.0,
    super.brRadiusY = 0.0,
    super.blRadiusX = 0.0,
    super.blRadiusY = 0.0,
    bool uniformRadii = false,
  }) : _uniformRadii = uniformRadii;

  @override
  RSuperellipse _create({
    required double left,
    required double top,
    required double right,
    required double bottom,
    required double tlRadiusX,
    required double tlRadiusY,
    required double trRadiusX,
    required double trRadiusY,
    required double brRadiusX,
    required double brRadiusY,
    required double blRadiusX,
    required double blRadiusY,
    required bool uniformRadii,
  }) => RSuperellipse._raw(
    top: top,
    left: left,
    right: right,
    bottom: bottom,
    tlRadiusX: tlRadiusX,
    tlRadiusY: tlRadiusY,
    trRadiusX: trRadiusX,
    trRadiusY: trRadiusY,
    blRadiusX: blRadiusX,
    blRadiusY: blRadiusY,
    brRadiusX: brRadiusX,
    brRadiusY: brRadiusY,
    uniformRadii: uniformRadii,
  );

  @override
  final bool _uniformRadii;

  static (double, double) _normalizeEmptyToZero(double inputX, double inputY) {
    return (inputX > 0 && inputY > 0) ? (inputX, inputY) : (0, 0);
  }

  static double _adjustScale(double radius1, double radius2, double dimension, double scale) {
    assert(radius1 >= 0.0 && radius2 >= 0.0 && dimension > 0.0);
    if (radius1 + radius2 > dimension) {
      return math.min(scale, dimension / (radius1 + radius2));
    }
    return scale;
  }

  /// (Web only) Returns a [Path] for this shape and an [Offset] for its
  /// placement.
  ///
  /// To correctly position the shape, the caller is required to apply the
  /// returned `offset` to the `path`.
  ///
  /// The returned path's coordinate system is relative to the `offset`. The
  /// caller should not make any assumptions about the path's origin or whether
  /// the offset is zero, as the implementation may use different strategies for
  /// efficiency.
  ///
  /// For example, to draw the shape, first translate the canvas by the `offset`
  /// and then draw the `path`. To add it to another path, provide both the
  /// `path` and the `offset` to the `addPath` method.
  (Path, Offset) toPathOffset() {
    if (_uniformRadii) {
      return (_RSuperellipseCache.instance.get(width, height, _scaledUniformRadii()), center);
    } else {
      return (_RSuperellipsePathBuilder.exact(_toScaledRadii()).path, Offset.zero);
    }
  }

  // Approximates a rounded superellipse with a round rectangle to the
  // best practical accuracy.
  //
  // This workaround is needed until the rounded superellipse is implemented on
  // Web. https://github.com/flutter/flutter/issues/163718
  RRect toApproximateRRect() {
    // Experiments have shown that using the same corner radii for the RRect
    // provides an approximation that is close to optimal, as achieving a perfect
    // match is not feasible.
    return RRect._raw(
      top: top,
      left: left,
      right: right,
      bottom: bottom,
      tlRadiusX: tlRadiusX,
      tlRadiusY: tlRadiusY,
      trRadiusX: trRadiusX,
      trRadiusY: trRadiusY,
      blRadiusX: blRadiusX,
      blRadiusY: blRadiusY,
      brRadiusX: brRadiusX,
      brRadiusY: brRadiusY,
    );
  }

  /// Returns a [RSuperellipse] whose corner radii are scaled based on this one,
  /// ensuring that the sum of the corner radii on each side does not exceed the
  /// width or height of the given bounds.
  ///
  /// See the [Skia scaling
  /// implementation](https://github.com/google/skia/blob/main/src/core/SkRRect.cpp)
  /// for more details.
  RSuperellipse _toScaledRadii() {
    if (!(width > 0 && height > 0)) {
      return RSuperellipse.fromLTRBXY(left, top, right, bottom, 0.0, 0.0);
    }

    // If any corner is flat or has a negative value, normalize it to zeros
    // We do this first so that the unnecessary non-flat part of that radius
    // does not contribute to the global scaling below.
    final (double tlRadiusX, double tlRadiusY) = _normalizeEmptyToZero(
      this.tlRadiusX,
      this.tlRadiusY,
    );
    final (double trRadiusX, double trRadiusY) = _normalizeEmptyToZero(
      this.trRadiusX,
      this.trRadiusY,
    );
    final (double blRadiusX, double blRadiusY) = _normalizeEmptyToZero(
      this.blRadiusX,
      this.blRadiusY,
    );
    final (double brRadiusX, double brRadiusY) = _normalizeEmptyToZero(
      this.brRadiusX,
      this.brRadiusY,
    );

    // Now determine a global scale to apply to all of the radii to ensure
    // that none of the adjacent pairs of radius values sum to larger than
    // the corresponding dimension of the rectangle.
    double scale = 1.0;
    scale = _adjustScale(tlRadiusX, trRadiusX, width, scale);
    scale = _adjustScale(blRadiusX, brRadiusX, width, scale);
    scale = _adjustScale(tlRadiusY, blRadiusY, height, scale);
    scale = _adjustScale(trRadiusY, brRadiusY, height, scale);
    if (scale < 1.0) {
      return _create(
        left: left,
        top: top,
        right: right,
        bottom: bottom,
        tlRadiusX: tlRadiusX * scale,
        tlRadiusY: tlRadiusY * scale,
        trRadiusX: trRadiusX * scale,
        trRadiusY: trRadiusY * scale,
        brRadiusX: brRadiusX * scale,
        brRadiusY: brRadiusY * scale,
        blRadiusX: blRadiusX * scale,
        blRadiusY: blRadiusY * scale,
        uniformRadii: _uniformRadii,
      );
    } else {
      return this;
    }
  }

  // A variation of `_toScaledRadii` that deals with uniform radii and returns a
  // `Radius`.
  Radius _scaledUniformRadii() {
    assert(_uniformRadii);
    if (!(width > 0 && height > 0)) {
      return Radius.zero;
    }
    final (double radiusX, double radiusY) = _normalizeEmptyToZero(tlRadiusX, tlRadiusY);
    double scale = 1.0;
    scale = _adjustScale(radiusX, radiusX, width, scale);
    scale = _adjustScale(radiusY, radiusY, height, scale);
    return Radius.elliptical(radiusX * scale, radiusY * scale);
  }

  static const RSuperellipse zero = RSuperellipse._raw();

  bool contains(Offset point) {
    final (Path path, Offset offset) = toPathOffset();
    return path.contains(point - offset);
  }

  static RSuperellipse? lerp(RSuperellipse? a, RSuperellipse? b, double t) {
    if (a == null) {
      if (b == null) {
        return null;
      }
      return b._lerpTo(null, 1 - t);
    }
    return a._lerpTo(b, t);
  }

  @override
  String toString() {
    return _toString(className: 'RSuperellipse');
  }
}

// Modeled after Skia's SkRSXform.

class RSTransform {
  RSTransform(double scos, double ssin, double tx, double ty) {
    _value
      ..[0] = scos
      ..[1] = ssin
      ..[2] = tx
      ..[3] = ty;
  }
  factory RSTransform.fromComponents({
    required double rotation,
    required double scale,
    required double anchorX,
    required double anchorY,
    required double translateX,
    required double translateY,
  }) {
    final double scos = math.cos(rotation) * scale;
    final double ssin = math.sin(rotation) * scale;
    final double tx = translateX + -scos * anchorX + ssin * anchorY;
    final double ty = translateY + -ssin * anchorX - scos * anchorY;
    return RSTransform(scos, ssin, tx, ty);
  }

  final Float32List _value = Float32List(4);
  double get scos => _value[0];
  double get ssin => _value[1];
  double get tx => _value[2];
  double get ty => _value[3];
}
